Silent-alarm wrist watch



Feb. 12 1924. 1,483,768

R. BlcKl-:RTON

SILENT ALARM WRIST WATCH Filed June l5. 1922 INVENTOR v BY 4 WITNESATTORNEY Patented Feb. 12, 1924.

PATENT OFFICE.

RALPH BICKERTON, OF BROOKLYN, NEW YORK.

lsILENfr-Annax Application nled June 15,

To all whom it may concern:

Be it known that I, RALPH BroKER'roN, a citizen of the United States,residin at Brooklyn, in the county of Kings and tate of New York, haveinvented new and useful Improvements in SilenteAlarm Wrist Watches, ofwhich the following is a speci-v fication.

This invention relates to silent alarm 1o wrist watches, and theprincipal object is'to provide a Wirist watch with means. whereby thewearer ma be awakened or notified when a desir time has arrived withoutthe use of a bell or other audible alarm.

Anotherobject is to produce a device of this nature which shall besimple of construction, cheap to manufacture, and highly efficient forthe purpose for which it is des'lgged. .c p ith these and other ob]ectsin view, the

invention resides in certain novel construction and combination andarrangement of arts, the essential features of which are Vereinafterfully described, are particularly pointed out in the appended claims,and are illustrated in the accompanying drawing, in whichzy Figure l isa horizontal sectional view of a watch case showing my device installedtherein. c

Figure 2 is a part section taken on line 2--2 Like characters ofreference refer to like parts in all views.

Referring to the drawing in detail, 10 represents the case of the watch.which is provided with the usual wrist strap 11 and which may be of anysuitable well-known construction. The watch may be provided with anysuitable form of movement, and as these devices are well-known in theart no movement is showln. Any suitable mechanism may be provided forreleasing the spring of the alarm mechanism hereinafter described, therebeing any number of these vdevices in the prior art and they will nodoubt suggest themselves to the mechanic skilled in the art. y

The invention proper consists in mounting in any suitable manner aspring drum WRIST WATCH. 1922. seriaino. 563,592.

12 to which is secured a spring 13 adapted to be wound by any suitablemechanism. In order to revent retrograde movement of the drum provide aratchet 13a for coaction with the dog 13b, the ratchet 138L beingsecured to a spindle 13C. The spindle 13'* extends through the face ofthe watch and is provided with a squared portion 13d for receiving asuitable key whereby thespring is adapted to be rewound. Secured to thespring drum 12 is a cam wheel 14 provided with a plurality of cams 15`on its outer surface, the cams 15 are adapted to reciprocate a needleor plunger 16 mounted in a bushing or sheath 17 secured to the case 10of the watch. The case is provided with an aperture 18 to permit thepassage of the needle or plunger 16 through the case, and a spring 19secured to the inner surface of the wgatch case operates to constantlypress the plunger 16 toward the cams 15. When at rest, the plunger isentirely within the case so as not to scratch the wrist.

The operation of the device is as follows :-The watch is strapped to thewrist ,in the usual manner which brings the aperture 18 into Contactwith the wrist ofthe wearer. The spring 13 is tensioned and the deviceis set for the time at which a person wishes to be awakened or forhaving his attention drawn to the fact that such time has arrived. Whenthe time arrives and the spring is released the drum 12 will rotatecarrying with it the cam disk 14, and the cams 15 will successivelyengage the plunger 17 and reciprocate it so as to cause a slightpricking of the wearers wrist. Any suitable mechanism may be providedfor turning the device off when the sleeper awakes While I havedescribed what I deem to be the most desirable embodiment of myinvention, it is obvious that many of the details may be varied withoutin any way departing from the spirit of my invention, and I therefore donot limit myself to the exact details of construction herein set forthnor to anything less than the whole of my invention limited only by theappended claim.

What is claimed as new is:- A wrist watch alarm comprising a watch lcasing, a spring actuated drum mounted for rotation in said casing, aplurality ol' undulatons formed on said drum. a plunger mounted in saidcasing and arranged parallel to the vertical axis of said drum, and aspring oooperating with said plunger for normally holding the same inretracted position and into-engagement with said unclulatlons, wherebyrotatxon of said drum wlll In testimony whereof I have alllxed mysignature.

RALPH BICKERTON.

